Signatures Medicare accepts — and the attestation fix
Summary
Medicare requires every service to be authenticated by the author — a legible handwritten signature or a valid electronic one that identifies who performed or ordered it. A signature stamp is generally not accepted. When a note is unsigned or the signature is illegible and records are reviewed, a signature attestation statement can cure it: a signed, dated statement affirming the author wrote that entry. It authenticates an existing note; it does not let you create documentation after the fact.
By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.
What Medicare accepts as a signature
Every service Medicare pays for must be authenticated by the author — a legible handwritten signature or a valid electronic signature showing who performed or ordered it 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.. The signature is what ties the documentation to a person and says they stand behind it. A missing or illegible signature is not a formatting nitpick: in a records review it can make an otherwise complete note fail to support the service 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review..
A signature stamp is generally not accepted as authentication 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.. And "signed" means the note is complete and attributed — a draft left unsigned in the record is unauthenticated no matter how thorough its content.
Electronic signatures — what makes one valid
An electronic signature counts when the system attributes it to the author, dates it, and prevents alteration after signing 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.. The familiar "Electronically signed by [name], [date]" line is the pattern, and the signer must be the person who furnished or ordered the service. What Medicare is checking is authenticity: that a specific, identified clinician signed this specific entry, at a known time, and that it was locked afterward 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review..
Configuration matters more than the label. An EHR that lets a note sit in a "pending" state, or that reassigns authorship loosely, can produce entries that look signed but do not authenticate. Your MAC's signature article spells out how it evaluates electronic signatures in its jurisdiction 3Ref 3CGS Medicare (2026).CGS Medicare.That a MAC publishes its own signature article applying Medicare's authentication rules in review for its jurisdiction — the specific standard a provider is measured against on a records request..
The attestation fix: curing a missing signature
When a note is unsigned or the signature is illegible and records are requested, Medicare allows a signature attestation statement — a signed, dated statement by the author affirming that they authored the specific entry 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.. It authenticates an entry that already exists; it does not let you write documentation after the fact. Done correctly, it can rescue a claim that would otherwise fail review for a signature deficiency 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review..
There are limits. Attestation cannot supply a signature the rules required at the time of service for certain orders, and it cannot backfill missing content 2Ref 2Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That the operative signature and documentation instructions live in CMS's Internet-Only Manuals, including the limits on what a signature attestation can and cannot cure.. A related tool is a signature log: a reference that matches an author's illegible initials to a printed name and credential, so a reviewer can read who signed 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.. The operative instruction for both lives in Medicare's manuals 2Ref 2Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That the operative signature and documentation instructions live in CMS's Internet-Only Manuals, including the limits on what a signature attestation can and cannot cure..
Where the rule lives — and why your MAC matters
The signature requirements are set in Medicare's manuals — the program-integrity instruction — and your MAC publishes its own signature article applying them in review 2Ref 2Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That the operative signature and documentation instructions live in CMS's Internet-Only Manuals, including the limits on what a signature attestation can and cannot cure.3Ref 3CGS Medicare (2026).CGS Medicare.That a MAC publishes its own signature article applying Medicare's authentication rules in review for its jurisdiction — the specific standard a provider is measured against on a records request.. When a records request cites a signature problem, the MAC's article is the specific standard you are measured against, so the reliable move is to read your own MAC's signature guidance rather than a general summary 3Ref 3CGS Medicare (2026).CGS Medicare.That a MAC publishes its own signature article applying Medicare's authentication rules in review for its jurisdiction — the specific standard a provider is measured against on a records request.4Ref 4Novitas Solutions Medicare (2026).Novitas Solutions Medicare.That a MAC publishes jurisdiction-specific signature and documentation guidance, cited alongside another MAC so a reader looks to whichever contractor serves them rather than a single portal.. Different MACs word the operational details differently, even though the underlying rule is common 4Ref 4Novitas Solutions Medicare (2026).Novitas Solutions Medicare.That a MAC publishes jurisdiction-specific signature and documentation guidance, cited alongside another MAC so a reader looks to whichever contractor serves them rather than a single portal..
This is why one clinician's remembered rule of thumb can be wrong for another's jurisdiction. The manual sets the frame; the MAC article is what a reviewer actually opens when your records land on their desk 3Ref 3CGS Medicare (2026).CGS Medicare.That a MAC publishes its own signature article applying Medicare's authentication rules in review for its jurisdiction — the specific standard a provider is measured against on a records request..
Why an unsigned note loses an audit
In a records review, an unauthenticated note can be treated as though the service is not supported, even when the clinical content is thorough 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.. The signature is the link between the documentation and the person and date behind it, so the note that supports your E/M level, or your order, only counts if it is authenticated 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.5Ref 5Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That documentation must support the service billed — an E/M level is selected from documented medical decision making or total time — so an authenticated signature is what makes the supporting note count.. This is how signatures decide audits that the underlying care would otherwise have won.
The defensible note is the signed one. Two records can describe identical care; the one that survives review is the one a reviewer can attribute to a specific author on a specific date, because that is what a signature is for 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review..
Building the habit so it never bites
The durable fix is to authenticate at the time of service and to configure the record so it happens by default. Signing and dating each encounter as it closes, setting the EHR to attribute and lock signed notes, keeping a current signature log for initials, and periodically checking that every billed encounter has an authenticated author are the operational habits that keep signatures from ever surfacing in a review 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.2Ref 2Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That the operative signature and documentation instructions live in CMS's Internet-Only Manuals, including the limits on what a signature attestation can and cannot cure..
If a review does claw back paid claims over a signature gap you cannot cure, the money comes back the same way any overpayment does — refunding Medicare within the deadline once the amount is identified. Telehealth and remote encounters are held to the same authentication standard, so medicare telehealth notes need a valid signature exactly as in-person ones do 1Ref 1Centers for Medicare & Medicaid Services (2023).Complying with Medicare Signature Requirements.That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review..
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- 1.Centers for Medicare & Medicaid Services (2023). Complying with Medicare Signature Requirements. CMS Medicare Learning Network (MLN905364). link ✓That Medicare requires each service to be authenticated by a legible handwritten or valid electronic signature, what counts as valid (including that a signature stamp is generally not accepted), and how a signature attestation statement or signature log cures a missing or illegible signature in review.
- 2.Centers for Medicare & Medicaid Services (2026). Internet-Only Manuals (IOMs). Centers for Medicare & Medicaid Services (CMS). link ✓That the operative signature and documentation instructions live in CMS's Internet-Only Manuals, including the limits on what a signature attestation can and cannot cure.
- 3.CGS Medicare (2026). CGS Medicare. Medicare Administrative Contractor portal. link ✓That a MAC publishes its own signature article applying Medicare's authentication rules in review for its jurisdiction — the specific standard a provider is measured against on a records request.
- 4.Novitas Solutions Medicare (2026). Novitas Solutions Medicare. Medicare Administrative Contractor portal. link ✓That a MAC publishes jurisdiction-specific signature and documentation guidance, cited alongside another MAC so a reader looks to whichever contractor serves them rather than a single portal.
- 5.Centers for Medicare & Medicaid Services (2023). Evaluation and Management Services Guide. CMS Medicare Learning Network (MLN006764). link ✓That documentation must support the service billed — an E/M level is selected from documented medical decision making or total time — so an authenticated signature is what makes the supporting note count.
https://www.gale.care/for-providers/mc-signature-requirements · 5 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.